Move generic VOL wrapper creation into helper #113

Job	Run time
build-and-test (autotools, true, multithread, production)	6h 0m 16s
build-and-test (autotools, true, multithread, debug)	51m 27s
build-and-test (autotools, true, threadsafe, production)	14m 56s
build-and-test (autotools, true, threadsafe, debug)	16m 30s
build-and-test (autotools, true, singlethread, production)	12m 39s
build-and-test (autotools, true, singlethread, debug)	14m 53s
build-and-test (autotools, false, multithread, production)	6h 0m 13s
build-and-test (autotools, false, multithread, debug)	6h 0m 14s
build-and-test (autotools, false, threadsafe, production)	13m 53s
build-and-test (autotools, false, threadsafe, debug)	15m 46s
build-and-test (autotools, false, singlethread, production)	11m 49s
build-and-test (autotools, false, singlethread, debug)	13m 39s
build-and-test (cmake, true, multithread, production)	23m 43s
build-and-test (cmake, true, multithread, debug)	23m 24s
build-and-test (cmake, true, threadsafe, production)	11m 43s
build-and-test (cmake, true, threadsafe, debug)	11m 56s
build-and-test (cmake, true, singlethread, production)	9m 50s
build-and-test (cmake, true, singlethread, debug)	9m 50s
build-and-test (cmake, false, multithread, production)	23m 23s
build-and-test (cmake, false, multithread, debug)	23m 48s
build-and-test (cmake, false, threadsafe, production)	11m 47s
build-and-test (cmake, false, threadsafe, debug)	12m 26s
build-and-test (cmake, false, singlethread, production)	9m 36s
build-and-test (cmake, false, singlethread, debug)	9m 37s
	23h 47m 18s

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